US PATENT SUBCLASS 122 / 122
.~.~.~ Water firebox

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

44.1  DF  FIRE TUBE {11}
114  DF  .~ Vertical {13}
121  DF  .~.~ Return fire tube {1}
122.~.~.~ Water firebox

DEFINITION

Classification: 122/122

(under subclass 121) Devices having a water firebox. The return fire tubes may be through the same boiler section or in another boiler section placed beside the other.